I'm an oaf and often get called Wreck It Ralph. Anyway, the latest thing I broke is the part pictured on my right hand side sliding door. I only knocked it gently whilst trying to retrieve a bottle of wine without disturbing my boy's sleep but knocked the castor out of the upper door runner! I got it back in OK and the door works manually but the auto lock function won't work and the door is always 'open' according to the dash so I'd like to replace the broken bit soonest. I can find most of the other parts separately but not this one, nor an exploded parts diagram. Is there anybody out there who has replaced the same part or am I going to have to replace the whole runner for £150!?